Show that the equation of the plane normal to the curve
F(x,y,z) = 0, G(x, y, z) = 0
at the point (x1, y1, z1) can be written in the vector form
dr • grad F × grad G = 0,
and write out the equation in rectangular coordinates. Use the results to find the normal planes to the curves of Problem at the points given.
Problem
b) x2 + y2 + z2 = 9,x2 + y2− 8z2 = 0 at (2, 2, 1);
c) x2 + y2 = 1,x + y + z = 0 at(1, 0, −1);
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